NYC Radio Repair Mechanic Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the main purpose of a capacitor in a radio circuit?
A) To amplify signals
B) To store and release electrical energy
C) To convert AC to DC
D) To regulate current flow
B) To store and release electrical energy
Rationale: Capacitors temporarily store electrical energy and release
it when needed, often used for filtering and tuning circuits.
2. Which component is primarily responsible for controlling the
frequency of a radio transmitter?
A) Resistor
B) Inductor
, C) Oscillator
D) Transformer
C) Oscillator
Rationale: An oscillator generates a periodic waveform at a specific
frequency, setting the radio’s transmission frequency.
3. What unit is used to measure electrical resistance?
A) Volt
B) Ampere
C) Ohm
D) Watt
C) Ohm
Rationale: Resistance, which opposes current flow, is measured in
ohms (Ω).
4. What does the term “modulation” refer to in radio communication?
A) Changing the frequency or amplitude of a carrier signal to transmit
information
B) Increasing the power of a radio signal
C) Converting AC to DC
D) Reducing noise in a circuit
A) Changing the frequency or amplitude of a carrier signal to
transmit information
Rationale: Modulation is the process of encoding information onto a
carrier wave for transmission.
,5. In a superheterodyne receiver, what is the function of the
intermediate frequency (IF) stage?
A) Amplify the signal before transmission
B) Convert the received signal to a fixed frequency for easier
processing
C) Generate carrier waves
D) Control the antenna
B) Convert the received signal to a fixed frequency for easier
processing
Rationale: The IF stage standardizes frequency, making amplification
and filtering more efficient.
6. Which type of diode allows current to flow in only one direction?
A) Zener diode
B) Light-emitting diode (LED)
C) Rectifier diode
D) Tunnel diode
C) Rectifier diode
Rationale: Rectifier diodes conduct current in a single direction,
essential for converting AC to DC.
7. What is the main function of a transformer in a radio power supply?
A) Store energy
B) Increase or decrease voltage
C) Filter noise
, D) Convert DC to AC
B) Increase or decrease voltage
Rationale: Transformers transfer electrical energy between circuits
and can step voltage up or down.
8. In radio terminology, what does “SNR” stand for?
A) Signal Noise Ratio
B) Signal-to-Noise Ratio
C) Super Noise Reduction
D) Standard Network Response
B) Signal-to-Noise Ratio
Rationale: SNR measures the ratio of useful signal to background
noise, indicating clarity of reception.
9. What is the typical function of a bandpass filter in a radio receiver?
A) Block all signals
B) Allow only a specific range of frequencies to pass
C) Increase signal power
D) Store electrical energy
B) Allow only a specific range of frequencies to pass
Rationale: Bandpass filters remove unwanted frequencies, isolating
the desired signal.
10. Which component is used to amplify weak radio signals?
A) Resistor
B) Capacitor
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the main purpose of a capacitor in a radio circuit?
A) To amplify signals
B) To store and release electrical energy
C) To convert AC to DC
D) To regulate current flow
B) To store and release electrical energy
Rationale: Capacitors temporarily store electrical energy and release
it when needed, often used for filtering and tuning circuits.
2. Which component is primarily responsible for controlling the
frequency of a radio transmitter?
A) Resistor
B) Inductor
, C) Oscillator
D) Transformer
C) Oscillator
Rationale: An oscillator generates a periodic waveform at a specific
frequency, setting the radio’s transmission frequency.
3. What unit is used to measure electrical resistance?
A) Volt
B) Ampere
C) Ohm
D) Watt
C) Ohm
Rationale: Resistance, which opposes current flow, is measured in
ohms (Ω).
4. What does the term “modulation” refer to in radio communication?
A) Changing the frequency or amplitude of a carrier signal to transmit
information
B) Increasing the power of a radio signal
C) Converting AC to DC
D) Reducing noise in a circuit
A) Changing the frequency or amplitude of a carrier signal to
transmit information
Rationale: Modulation is the process of encoding information onto a
carrier wave for transmission.
,5. In a superheterodyne receiver, what is the function of the
intermediate frequency (IF) stage?
A) Amplify the signal before transmission
B) Convert the received signal to a fixed frequency for easier
processing
C) Generate carrier waves
D) Control the antenna
B) Convert the received signal to a fixed frequency for easier
processing
Rationale: The IF stage standardizes frequency, making amplification
and filtering more efficient.
6. Which type of diode allows current to flow in only one direction?
A) Zener diode
B) Light-emitting diode (LED)
C) Rectifier diode
D) Tunnel diode
C) Rectifier diode
Rationale: Rectifier diodes conduct current in a single direction,
essential for converting AC to DC.
7. What is the main function of a transformer in a radio power supply?
A) Store energy
B) Increase or decrease voltage
C) Filter noise
, D) Convert DC to AC
B) Increase or decrease voltage
Rationale: Transformers transfer electrical energy between circuits
and can step voltage up or down.
8. In radio terminology, what does “SNR” stand for?
A) Signal Noise Ratio
B) Signal-to-Noise Ratio
C) Super Noise Reduction
D) Standard Network Response
B) Signal-to-Noise Ratio
Rationale: SNR measures the ratio of useful signal to background
noise, indicating clarity of reception.
9. What is the typical function of a bandpass filter in a radio receiver?
A) Block all signals
B) Allow only a specific range of frequencies to pass
C) Increase signal power
D) Store electrical energy
B) Allow only a specific range of frequencies to pass
Rationale: Bandpass filters remove unwanted frequencies, isolating
the desired signal.
10. Which component is used to amplify weak radio signals?
A) Resistor
B) Capacitor
